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  • Springer  (121)
  • 1980-1984  (106)
  • 1935-1939  (15)
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  • 1
    Digitale Medien
    Digitale Medien
    Activity coefficients of zinc chloride in the presence of lithium, sodium, and magnesium perchlorates, and magnesium nitrate in aqueous solution at 25°C (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 889-896 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Activity coefficients ; emf ; zinc chloride ; water activity ; Pitzer's equations ; solvation cosphere structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The standard potential of the Zn−Hg (sat)/ZnCl2(M)/AgCl/Ag cell was determined at 25°C using several extrapolation procedures and the value 0.9843 V is proposed for E°. The emf of the Zn−Hg (sat)/ZnCl2(M), salt (M)/AgCl/Ag cell [salt=NaClO4, LiClO4, Mg(ClO4)2, Mg(NO3)2] have been measured at different concentrations of salt. From these data, the mean ionic activity coefficients of ZnCl2 are determined and their variations explained with the aid of Pitzer's treatment. It seems necessary to take into account structure in the ionic cospheres in order to explain the observed variations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00644752
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Kinetic-fluorimetric determination of microamounts of cerium(IV) by means of sodium 4,8-diamino-1,5-dihydroxyanthraquinone-2,6-disulphonate (1982)
    Springer
    Microchimica acta 77 (1982), S. 175-181 
    Details
    ISSN: 1436-5073
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Eine kinetische Methode zur Bestimmung von Spuren Cer(IV) mit Hilfe von Natrium-4,8-diamino-1,5-dihydroxyanthrachinon-2,6-disulfonat wurde beschrieben. Dabei wird ein fluoreszierendes Oxydationsprodukt gebildet, das bei 525 nm angeregt mit einer maximalen Emission bei 585 nm fluoresziert. Die Reaktion ermöglicht die Bestimmung von 0,02–0,37 ppm Cer(IV). Die vorgeschlagene Methode wird nur durch wenige Störungen eingeschränkt.
    Notizen: Summary A kinetic method for determination of traces of Ce(IV), based on the oxidation of sodium 4,8-diamino-1,5-dihydroxyanthraquinone-2, 6-disulphonate is described. The reaction is monitored by means of the fluorescence of the oxidation product (λ ex=525nm,λ em=585 nm), and allows determination of 0.02–0.37 ppm Ce(IV). The proposed method has few interferences.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01237805
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  • 3
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    Kinetic-fluorimetric determination of microamounts of cerium(IV) by means of sodium 4,8-diamino-1,5-dihydroxyanthraquinone-2,6-disulphonate (1982)
    Springer
    Details
    Publikationsdatum: 1982-05-01
    Print ISSN: 0026-3672
    Digitale ISSN: 1436-5073
    Thema: Chemie und Pharmazie
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 4
    Digitale Medien
    Digitale Medien
    Linear age-dependent population growth with seasonal harvesting (1980)
    Springer
    Journal of mathematical biology 9 (1980), S. 361-368 
    Details
    ISSN: 1432-1416
    Schlagwort(e): Linear age-dependent models ; Harvesting
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract A population growth is modelled by the Von Foerster PDE with accompanying Lotka-Volterra integral equation describing the birth rate; the age specific death and fertility rates are assumed to depend only on age and not time. A harvesting policy where a fraction of the population of age greater than a given age is harvested for a fraction of a given season. This introduces a time dependence, but this difficulty is circumvented by devising approximate timeindependent models whose birthrates bracket the true birthrate-the standard renewal equation theory applies to the approximate models so quantitative results can be obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00276499
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    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Biochemical parameters to assess cell differentiation of Bouvardia ternifolia Schlecht callus (1983)
    Springer
    Planta 158 (1983), S. 377-383 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Bouvardia ; Nitrogen metabolism ; Tissue culture, biochemical dedifferentiation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Calli derived from leaves and radicles of B. ternifolia were grown on Murashige and Skoog (MS) basal medium, and the effects of different nitrogen sources on the rate of callus growth and on the enzymes related to nitrogen assimilation were studied. Ammonium alone did not support callus growth unless a Krebs-cycle intermediate was added to the medium. The activities of glutamine synthetase (EC 6.3.1.2), glutamate synthase (EC 1.4.7.1), and glutamate dehydrogenase (EC 1.4.1.2) were measured in homogenates of callus grown on media supplied with different nitrogen sources. The results indicate that leaf and root calli have similar levels of these enzymes when grown on MS medium (Murashige and Skoog 1962. Physiol. Plant. 15, 473–497). However, when the calli were supplied with glutamine as the sole nitrogen source, the activity of glutamate synthase increased in leaf callus but was almost completely inhibited in root callus. The results indicate that calli originated from different B. ternifolia tissues do not have the same biochemical dedifferentiated state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00397728
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    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Synthesis of acyl-CoAs by isolated spinach chloroplasts in relation to added CoA and ATP (1981)
    Springer
    Planta 153 (1981), S. 519-523 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Acyl-CoA synthesis ; Chloroplast (isolated) ; Lipid synthesis ; Spinacia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The kinetics of incorporation of [2-14C] acetate into lipids and acyl-CoAs in relation to added CoA and ATP by isolated spinach chloroplasts have been examined. The effect of the concentration of these cofactors on lipid and acyl-CoA synthesis was also studied. In the absence of cofactors, or when only one was present, the incorporation was very low and went mainly into lipids. When both cofactors were present a strong stimulation of both activities occurred. After 25 min, acyl-CoAs were more strongly labeled than lipids and both activities continued linearly for at least 60 min.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00385535
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    Artikel (Nationallizenzen)
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  • 7
    Digitale Medien
    Digitale Medien
    Bone mineral analysis of the rat femur by direct photon absorptiometry (1981)
    Springer
    Calcified tissue international 33 (1981), S. 587-590 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Bone analysis ; Densitometry ; Femur analysis ; Rat anatomy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Summary This report describes a method using direct photon absorptiometry (DPA) for determination in vivo of the bone mineral content to bone width ratio (BMC/W) in the rat femur. A significant correlation was noted between measurements by DPA and whole femur dry weight and ash weight. Measurements were reproducible within repeated determinations of both the same and successive days. Soft tissue, rotation of the femur, or slight differences in the longitudinal positioning of the femur did not significantly affect usefulness of the measurements. A significant positive correlation was seen between body weight and the femur BMC/W, indicating that the method accurately reflected expected physiological changes in bone mineral. The method is suitable for the rapid, simple, accurate, and reproducible measurement of bone mineral in the anesthetized rat and is applicable to serial measurements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02409496
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    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Direct phonon-assisted transitions near the fundamental absorption edge in CuInSe2 (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1895-1899 
    Details
    ISSN: 0392-6737
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto Lo spettro di assorbimento vicino al bordo di assorbimento fondamentale di un cristallo singolo di tipon di CuInSe2, cresciuto col metodo di Bridgman, è stato studiato a 100 e 300 K. Si osserva un bordo di assorbimento in corrispondenza della transizione del gap di banda diretta a circa 1 eV. Un ulteriore assorbimento è osservato a energie inferiori ((0.93÷0.95) eV) ed è attribuito a transizioni dirette alla presenza di fononi ottici a grande lunghezza d'onda.
    Kurzfassung: Резюме При 100 К и 300 К исследуется спектр поглощения вблизи основного края поглощения монокристалла CuInSe2 n-типа, выращенного по методу Ъридгмана, Вблизи 1 эВ обнаружен край поглощения, соответствующий прямому переходу. Дополнительное поглощение наблюдается при меньших энергиях ((0.93÷0.95) эВ) и приписывается прямым переходом, связанным с длинноволновыми оптическими фононами.
    Notizen: Summary The absorption spectrum near the fundamental absorption edge of an-type CuInSe2 single crystal grown by the Bridgman method has been studied at 100 and 300 K. An absorption edge corresponding to the direct-band-gap transition is observed at about 1 eV. An additional absorption is observed at lower energies ((0.93÷0.95) eV) and is attributed to direct transitions assisted by long-wave-length optical phonons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02457883
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  • 9
    Digitale Medien
    Digitale Medien
    Measurement of inducedβ-galactosidase activity in intact cells ofStreptomyces species (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 469-469 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary β-Galactosidase activity in intact cells of 21 species ofStreptomyces was measured using ONPG hydrolysis, without addition of a permeabilizing agent. Differences in the induction efficiency of ONPG-hydrolytic activity by lactose or galactose, which could have taxonomic implications, were observed among the species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01986139
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  • 10
    Digitale Medien
    Digitale Medien
    Studies on the modification ofEscherichia coli ribosomal protein L7/L12 by succinic anhydride (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 241-243 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Lysine modification by increasing quantities of succinic anhydride in theEscherichia coli ribosomal protein L7/L12 produces loss of its ability in reconstitution of elongation-factor-G-dependent GTP hydrolysis and polyphenylalanine synthesis activities, showing lower antigenicity and loss of antigenic determinants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01945089
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
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